The Viaduct Works' Handbook
Forfatter: Henry N. Maynard
År: 1868
Forlag: E. And F. N. Spon
Sted: London
Sider: 108
UDK: 624.3
Being A Collection Of Examples From Actual Practice Of Viaducts, Bridges, Roofs, And Other Structures In Iron; Together With Tables Of Prices, Weights, And Other Information Useful To Engineers In Design And Estimating Wrought And Cast-Iron Work
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92
Diameter of Sheave. Diameter of Chain. Girth of Rope. Price per pair, 1 & 2 Sheave. Price per pair, 2 & 8 Sheave. Snatch Blocks each.
.In. In. In. £ s. d. £ s. d. £ s. d.
3 * 21 1 10 0 260 10 0
4 16 3 2 0 0 2 17 6 112 0
.5 § 34 2 12 6 3 10 0 2 5 0
6 7 16 4 350 426 2 16 0
7 * 5 4 15 0 6 12 6 3 10 0
8 9 16 6 6 15 0 8 15 0 |A 1• |©
Common articles may be had 20 per cent. less.
KENNARD’S DUPLEX RIVETTING MACHINE.
HALF SECTIONAL ELEVATION. HALF ELEVATION,
END ELEVATION.
This machine is adapted for performing all kinds of work usually
done by ordinary rivetting machinery ; hut instead of forming only one
of the heads of the rivets as such machines usually do, it forms both
heads at the same time. The rivets, or, more properly speaking, the
blanks, are merely short pieces of rod iron, cut off by the shears at
the end of the machine from bars of ordinary round iron. The bars
are heated in a furnace close at hand; the blanks are then cut off to
the proper length regulated by gauge, and placed in the work to be
nvetted between the snaps, when the slides advance simultaneously
from both heads at the same instant.
The machine, as will be seen by reference to the engraving, con-
sists of a strong cast-iron hollow framing, inside which is contained